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<center><h1>FreeType-2.4.12 API Reference</h1></center>

<center><h1>
The auto-hinter
</h1></center>
<h2>Synopsis</h2>
<table align=center cellspacing=5 cellpadding=0 border=0>
<tr><td></td><td><a href="#glyph-to-script-map">glyph-to-script-map</a></td><td></td><td><a href="#fallback-script">fallback-script</a></td></tr>
<tr><td></td><td><a href="#FT_AUTOHINTER_SCRIPT_XXX">FT_AUTOHINTER_SCRIPT_XXX</a></td><td></td><td><a href="#increase-x-height">increase-x-height</a></td></tr>
<tr><td></td><td><a href="#FT_Prop_GlyphToScriptMap">FT_Prop_GlyphToScriptMap</a></td><td></td><td><a href="#FT_Prop_IncreaseXHeight">FT_Prop_IncreaseXHeight</a></td></tr>
</table><br><br>

<table align=center width="87%"><tr><td>
<p>While FreeType's auto-hinter doesn't expose API functions by itself, it is possible to control its behaviour with <a href="ft2-module_management.html#FT_Property_Set">FT_Property_Set</a> and <a href="ft2-module_management.html#FT_Property_Get">FT_Property_Get</a>. The following lists the available properties together with the necessary macros and structures.</p>
<p>Note that the auto-hinter's module name is &lsquo;autofitter&rsquo; for historical reasons.</p>
</td></tr></table><br>
<table align=center width="75%"><tr><td>
<h4><a name="glyph-to-script-map">glyph-to-script-map</a></h4>
<table align=center width="87%"><tr><td>
<p>The auto-hinter provides various script modules to hint glyphs. Examples of supported scripts are Latin or CJK. Before a glyph is auto-hinted, the Unicode character map of the font gets examined, and the script is then determined based on Unicode character ranges, see below.</p>
<p>OpenType fonts, however, often provide much more glyphs than character codes (small caps, superscripts, ligatures, swashes, etc.), to be controlled by so-called &lsquo;features&rsquo;. Handling OpenType features can be quite complicated and thus needs a separate library on top of FreeType.</p>
<p>The mapping between glyph indices and scripts (in the auto-hinter sense, see the <a href="ft2-auto_hinter.html#FT_AUTOHINTER_SCRIPT_XXX">FT_AUTOHINTER_SCRIPT_XXX</a> values) is stored as an array with &lsquo;num_glyphs&rsquo; elements, as found in the font's <a href="ft2-base_interface.html#FT_Face">FT_Face</a> structure. The &lsquo;glyph-to-script-map&rsquo; property returns a pointer to this array which can be modified as needed. Note that the modification should happen before the first glyph gets processed by the auto-hinter so that the global analysis of the font shapes actually uses the modified mapping.</p>
<p>The following example code demonstrates how to access it (omitting the error handling).</p>
<pre class="colored">
  FT_Library                library;
  FT_Face                   face;
  FT_Prop_GlyphToScriptMap  prop;


  FT_Init_FreeType( &amp;library );
  FT_New_Face( library, "foo.ttf", 0, &amp;face );

  prop.face = face;

  FT_Property_Get( library, "autofitter",
                            "glyph-to-script-map", &amp;prop );

  // adjust `prop.map' as needed right here

  FT_Load_Glyph( face, ..., FT_LOAD_FORCE_AUTOHINT );
</pre>
</td></tr></table><br>
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<td><font size=-2>[<a href="ft2-toc.html">TOC</a>]</font></td></tr></table>

<table align=center width="75%"><tr><td>
<h4><a name="FT_AUTOHINTER_SCRIPT_XXX">FT_AUTOHINTER_SCRIPT_XXX</a></h4>
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Defined in FT_AUTOHINTER_H (freetype/ftautoh.h).
</td></tr></table><br>
<table align=center width="87%"><tr bgcolor="#D6E8FF"><td><pre>

#define <a href="ft2-auto_hinter.html#FT_AUTOHINTER_SCRIPT_XXX">FT_AUTOHINTER_SCRIPT_NONE</a>   0
#define <a href="ft2-auto_hinter.html#FT_AUTOHINTER_SCRIPT_XXX">FT_AUTOHINTER_SCRIPT_LATIN</a>  1
#define <a href="ft2-auto_hinter.html#FT_AUTOHINTER_SCRIPT_XXX">FT_AUTOHINTER_SCRIPT_CJK</a>    2
#define <a href="ft2-auto_hinter.html#FT_AUTOHINTER_SCRIPT_XXX">FT_AUTOHINTER_SCRIPT_INDIC</a>  3

</pre></table><br>
<table align=center width="87%"><tr><td>
<p>A list of constants used for the <a href="ft2-auto_hinter.html#glyph-to-script-map">glyph-to-script-map</a> property to specify the script submodule the auto-hinter should use for hinting a particular glyph.</p>
</td></tr></table><br>
<table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>values</b></em></td></tr><tr><td>
<p></p>
<table cellpadding=3 border=0>
<tr valign=top><td colspan=0><b>FT_AUTOHINTER_SCRIPT_NONE</b></td></tr>
<tr valign=top><td></td><td>
<p>Don't auto-hint this glyph.</p>
</td></tr>
<tr valign=top><td colspan=0><b>FT_AUTOHINTER_SCRIPT_LATIN</b></td></tr>
<tr valign=top><td></td><td>
<p>Apply the latin auto-hinter. For the auto-hinter, &lsquo;latin&rsquo; is a very broad term, including Cyrillic and Greek also since characters from those scripts share the same design constraints.</p>
<p>By default, characters from the following Unicode ranges are assigned to this submodule.</p>
<pre class="colored">
  U+0020 - U+007F  // Basic Latin (no control characters)
  U+00A0 - U+00FF  // Latin-1 Supplement (no control characters)
  U+0100 - U+017F  // Latin Extended-A
  U+0180 - U+024F  // Latin Extended-B
  U+0250 - U+02AF  // IPA Extensions
  U+02B0 - U+02FF  // Spacing Modifier Letters
  U+0300 - U+036F  // Combining Diacritical Marks
  U+0370 - U+03FF  // Greek and Coptic
  U+0400 - U+04FF  // Cyrillic
  U+0500 - U+052F  // Cyrillic Supplement
  U+1D00 - U+1D7F  // Phonetic Extensions
  U+1D80 - U+1DBF  // Phonetic Extensions Supplement
  U+1DC0 - U+1DFF  // Combining Diacritical Marks Supplement
  U+1E00 - U+1EFF  // Latin Extended Additional
  U+1F00 - U+1FFF  // Greek Extended
  U+2000 - U+206F  // General Punctuation
  U+2070 - U+209F  // Superscripts and Subscripts
  U+20A0 - U+20CF  // Currency Symbols
  U+2150 - U+218F  // Number Forms
  U+2460 - U+24FF  // Enclosed Alphanumerics
  U+2C60 - U+2C7F  // Latin Extended-C
  U+2DE0 - U+2DFF  // Cyrillic Extended-A
  U+2E00 - U+2E7F  // Supplemental Punctuation
  U+A640 - U+A69F  // Cyrillic Extended-B
  U+A720 - U+A7FF  // Latin Extended-D
  U+FB00 - U+FB06  // Alphab. Present. Forms (Latin Ligatures)
 U+1D400 - U+1D7FF // Mathematical Alphanumeric Symbols
 U+1F100 - U+1F1FF // Enclosed Alphanumeric Supplement
</pre>
<p></p>
</td></tr>
<tr valign=top><td colspan=0><b>FT_AUTOHINTER_SCRIPT_CJK</b></td></tr>
<tr valign=top><td></td><td>
<p>Apply the CJK auto-hinter, covering Chinese, Japanese, Korean, old Vietnamese, and some other scripts.</p>
<p>By default, characters from the following Unicode ranges are assigned to this submodule.</p>
<pre class="colored">
  U+1100 - U+11FF  // Hangul Jamo
  U+2E80 - U+2EFF  // CJK Radicals Supplement
  U+2F00 - U+2FDF  // Kangxi Radicals
  U+2FF0 - U+2FFF  // Ideographic Description Characters
  U+3000 - U+303F  // CJK Symbols and Punctuation
  U+3040 - U+309F  // Hiragana
  U+30A0 - U+30FF  // Katakana
  U+3100 - U+312F  // Bopomofo
  U+3130 - U+318F  // Hangul Compatibility Jamo
  U+3190 - U+319F  // Kanbun
  U+31A0 - U+31BF  // Bopomofo Extended
  U+31C0 - U+31EF  // CJK Strokes
  U+31F0 - U+31FF  // Katakana Phonetic Extensions
  U+3200 - U+32FF  // Enclosed CJK Letters and Months
  U+3300 - U+33FF  // CJK Compatibility
  U+3400 - U+4DBF  // CJK Unified Ideographs Extension A
  U+4DC0 - U+4DFF  // Yijing Hexagram Symbols
  U+4E00 - U+9FFF  // CJK Unified Ideographs
  U+A960 - U+A97F  // Hangul Jamo Extended-A
  U+AC00 - U+D7AF  // Hangul Syllables
  U+D7B0 - U+D7FF  // Hangul Jamo Extended-B
  U+F900 - U+FAFF  // CJK Compatibility Ideographs
  U+FE10 - U+FE1F  // Vertical forms
  U+FE30 - U+FE4F  // CJK Compatibility Forms
  U+FF00 - U+FFEF  // Halfwidth and Fullwidth Forms
 U+1B000 - U+1B0FF // Kana Supplement
 U+1D300 - U+1D35F // Tai Xuan Hing Symbols
 U+1F200 - U+1F2FF // Enclosed Ideographic Supplement
 U+20000 - U+2A6DF // CJK Unified Ideographs Extension B
 U+2A700 - U+2B73F // CJK Unified Ideographs Extension C
 U+2B740 - U+2B81F // CJK Unified Ideographs Extension D
 U+2F800 - U+2FA1F // CJK Compatibility Ideographs Supplement
</pre>
<p></p>
</td></tr>
<tr valign=top><td colspan=0><b>FT_AUTOHINTER_SCRIPT_INDIC</b></td></tr>
<tr valign=top><td></td><td>
<p>Apply the indic auto-hinter, covering all major scripts from the Indian sub-continent and some other related scripts like Thai, Lao, or Tibetan.</p>
<p>By default, characters from the following Unicode ranges are assigned to this submodule.</p>
<pre class="colored">
  U+0900 - U+0DFF  // Indic Range
  U+0F00 - U+0FFF  // Tibetan
  U+1900 - U+194F  // Limbu
  U+1B80 - U+1BBF  // Sundanese
  U+1C80 - U+1CDF  // Meetei Mayak
  U+A800 - U+A82F  // Syloti Nagri
 U+11800 - U+118DF // Sharada
</pre>
<p>Note that currently Indic support is rudimentary only, missing blue zone support.</p>
</td></tr>
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<table align=center width="75%"><tr><td>
<h4><a name="FT_Prop_GlyphToScriptMap">FT_Prop_GlyphToScriptMap</a></h4>
<table align=center width="87%"><tr><td>
Defined in FT_AUTOHINTER_H (freetype/ftautoh.h).
</td></tr></table><br>
<table align=center width="87%"><tr bgcolor="#D6E8FF"><td><pre>

   <span class="keyword">typedef</span> <span class="keyword">struct</span>  FT_Prop_GlyphToScriptMap_
   {
     <a href="ft2-base_interface.html#FT_Face">FT_Face</a>   face;
     <a href="ft2-basic_types.html#FT_Byte">FT_Byte</a>*  map;

   } <b>FT_Prop_GlyphToScriptMap</b>;

</pre></table><br>
<table align=center width="87%"><tr><td>
<p>The data exchange structure for the <a href="ft2-auto_hinter.html#glyph-to-script-map">glyph-to-script-map</a> property.</p>
</td></tr></table><br>
</td></tr></table>
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<table align=center width="75%"><tr><td>
<h4><a name="fallback-script">fallback-script</a></h4>
<table align=center width="87%"><tr><td>
<p>If no auto-hinter script module can be assigned to a glyph, a fallback script gets assigned to it (see also the <a href="ft2-auto_hinter.html#glyph-to-script-map">glyph-to-script-map</a> property). By default, this is <a href="ft2-auto_hinter.html#FT_AUTOHINTER_SCRIPT_XXX">FT_AUTOHINTER_SCRIPT_CJK</a>. Using the &lsquo;fallback-script&rsquo; property, this fallback value can be changed.</p>
<pre class="colored">
  FT_Library  library;
  FT_UInt     fallback_script = FT_AUTOHINTER_SCRIPT_NONE;


  FT_Init_FreeType( &amp;library );

  FT_Property_Set( library, "autofitter",
                            "fallback-script", &amp;fallback_script );
</pre>
</td></tr></table><br>
<table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>note</b></em></td></tr><tr><td>
<p>This property can be used with <a href="ft2-module_management.html#FT_Property_Get">FT_Property_Get</a> also.</p>
<p>It's important to use the right timing for changing this value: The creation of the glyph-to-script map which eventually uses the fallback script value gets triggered either by setting or reading a face-specific property like <a href="ft2-auto_hinter.html#glyph-to-script-map">glyph-to-script-map</a>, or by auto-hinting any glyph from that face. In particular, if you have already created an <a href="ft2-base_interface.html#FT_Face">FT_Face</a> structure but not loaded any glyph (using the auto-hinter), a change of the fallback glyph will affect this face.</p>
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<table align=center width="75%"><tr><td>
<h4><a name="increase-x-height">increase-x-height</a></h4>
<table align=center width="87%"><tr><td>
<p>For ppem values in the range 6&nbsp;&lt;= ppem &lt;= &lsquo;increase-x-height&rsquo;, round up the font's x&nbsp;height much more often than normally. If the value is set to&nbsp;0, which is the default, this feature is switched off. Use this property to improve the legibility of small font sizes if necessary.</p>
<pre class="colored">
  FT_Library               library;
  FT_Face                  face;
  FT_Prop_IncreaseXHeight  prop;


  FT_Init_FreeType( &amp;library );
  FT_New_Face( library, "foo.ttf", 0, &amp;face );
  FT_Set_Char_Size( face, 10 * 64, 0, 72, 0 );

  prop.face  = face;
  prop.limit = 14;

  FT_Property_Set( library, "autofitter",
                            "increase-x-height", &amp;prop );
</pre>
</td></tr></table><br>
<table align=center width="87%" cellpadding=5><tr bgcolor="#EEEEFF"><td><em><b>note</b></em></td></tr><tr><td>
<p>This property can be used with <a href="ft2-module_management.html#FT_Property_Get">FT_Property_Get</a> also.</p>
<p>Set this value right after calling <a href="ft2-base_interface.html#FT_Set_Char_Size">FT_Set_Char_Size</a>, but before loading any glyph (using the auto-hinter).</p>
</td></tr></table>
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<table align=center width="75%"><tr><td>
<h4><a name="FT_Prop_IncreaseXHeight">FT_Prop_IncreaseXHeight</a></h4>
<table align=center width="87%"><tr><td>
Defined in FT_AUTOHINTER_H (freetype/ftautoh.h).
</td></tr></table><br>
<table align=center width="87%"><tr bgcolor="#D6E8FF"><td><pre>

   <span class="keyword">typedef</span> <span class="keyword">struct</span>  FT_Prop_IncreaseXHeight_
   {
     <a href="ft2-base_interface.html#FT_Face">FT_Face</a>  face;
     <a href="ft2-basic_types.html#FT_UInt">FT_UInt</a>  limit;

   } <b>FT_Prop_IncreaseXHeight</b>;

</pre></table><br>
<table align=center width="87%"><tr><td>
<p>The data exchange structure for the <a href="ft2-auto_hinter.html#increase-x-height">increase-x-height</a> property.</p>
</td></tr></table><br>
</td></tr></table>
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